Targeted Image Stabilization Using Region-Specific Lens Shifts
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Solution Overview
Problem
Conventional optical image stabilization methods often result in blurring at image locations other than the center, as different parts of the field of view require different lens shifts to achieve a blur-free condition, leading to suboptimal image quality.
Innovation Solution
The system detects changes in the camera's optical axis and calculates targeted lens shifts to minimize blurring at specific image locations, using equations to determine the necessary lens movements, ensuring that both the selected area and the image center maintain acceptable levels of clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional optical image stabilization processes control or modify paths of light by repositioning lenses to ensure the center of the image is free of blur, then the center of the image is stabilized, but other locations within the image remain subject to blurring
Solution Approach 1:
The patent applies local quality by calculating and applying different lens shift amounts for different regions of the image field. Instead of using a single lens position for the entire image, the system determines optimal lens shift values specific to each region (e.g., center region vs. peripheral regions), allowing each area to be optimized for its particular blurring characteristics while maintaining overall image stability.
Solution Approach 2:
The patent segments the image field into multiple regions (such as a center region and peripheral regions) and applies different stabilization strategies to each. The system calculates separate lens shift values for different regions based on their specific geometric characteristics and blurring patterns, enabling differentiated control rather than uniform treatment of the entire image.
2Manufacturing precision
If different lens shifts are applied to different parts of the field of view to eliminate blurring, then image quality at those locations improves, but the complexity of the stabilization process increases
Solution Approach 1:
The patent changes the parameter of lens shift amount dynamically based on the target region. The system calculates different lens shift values (first lens shift value for center region, second lens shift value for peripheral regions) and adjusts the lens position accordingly. This parameter adaptation allows the system to handle different blurring conditions at different locations without requiring a completely complex multi-position lens mechanism.
Data Source
AI summary
When a lens assembly of an imaging device is subject to impacts, vibrations or other movements, and an optical axis of a lens assembly is varied as a result of the movements, blurring or pixel shifts may be reduced or eliminated at a targeted location within an image plane by shifting a lens of the lens assembly by a distance calculated based on an angle corresponding to the selected location, an angular difference between orientations of the optical axis, and a focal length of the imaging device. If the distance would result in a pixel shift at a center of the image plane in excess of a maximum allowable pixel shift, an alternate distance may be calculated based on the maximum allowable pixel shift, the angular difference between orientations of the optical axis, and the focal length of the imaging device.